Search Publications
YOUNG Star detrending for Transiting Exoplanet Recovery (YOUNGSTER) - II. Using self-organizing maps to explore young star variability in sectors 1-13 of TESS data
Armstrong, David J.; Pollacco, Don; Battley, Matthew P.
Young exoplanets and their corresponding host stars are fascinating laboratories for constraining the time-scale of planetary evolution and planet-star interactions. However, because young stars are typically much more active than the older population, in order to discover more young exoplanets, greater knowledge of the wide array of young star va…
Revisiting the Circumnuclear X-Ray Emission of NGC 2992 in a Historically Low State
Wang, Junfeng; Xu, Xiaoyu
The innermost region of the Seyfert galaxy NGC 2992 has long been suspected to be the location of intense AGN-host galaxy interaction, but photon pile up in previous high-resolution observations hampered the study of the soft X-ray excess and the interaction near its nucleus. We present an X-ray imaging and spectroscopic analysis of the circumnucl…
IFU observations of the inner 200 pc of NGC 4546: gas rotation, non-circular motions, and ionized outflows
Riffel, Rogemar A.; Heckler, Kelly F.; Ricci, Tiago V.
We present a detailed analysis of the ionized gas distribution and kinematics in the inner ~ 200 pc of NGC 4546, host of a low-luminosity active galactic nucleus (LLAGN). Using GMOS-IFU observations, with a spectral coverage of 4736-6806 Å and an angular resolution of 0.7 arcsec, we confirm that the nuclear emission is consistent with photoionizat…
The Solar Orbiter EUI instrument: The Extreme Ultraviolet Imager (Corrigendum)
Vial, J. -C.; Zhang, X.; Peter, H. +146 more
Can Turbulent, High-density Gas Form Stars in Molecular Clouds: A Case Study in Ophiuchus
Tsai, Chao-Wei; Lin, Yuxin; Wu, Jingwen +3 more
Star formation is governed by the interplay between gravity and turbulence in most of molecular clouds. Recent theoretical works assume that dense gas, whose column density is above a critical value in the column density probability distribution function (N-PDF), where gravity starts to overcome turbulence, becomes star-forming gas and will collap…
Numerical Modeling of Suprathermal Electron Transport in the Solar Wind: Effects of Whistler Turbulence with a Full Diffusion Tensor
Zank, Gary P.; Tang, Bofeng; Kolobov, Vladimir I.
The electron VDF in the solar wind consists of a Maxwellian core, a suprathermal halo, a field-aligned component strahl, and an energetic superhalo that deviates from the equilibrium. Whistler wave turbulence is thought to resonantly scatter the observed electron velocity distribution. Wave-particle interactions that contribute to Whistler wave tu…
ACCESS: Tentative Detection of H2O in the Ground-based Optical Transmission Spectrum of the Low-density Hot Saturn HATS-5b
Kirk, James; López-Morales, Mercedes; Jordán, Andrés +13 more
We present a precise ground-based optical transmission spectrum of the hot Saturn HATS-5b (T eq = 1025 K), obtained as part of the ACCESS survey with the IMACS multi-object spectrograph mounted on the Magellan Baade Telescope. Our spectra cover the 0.5-0.9 µm region and are the product of five individual transits observed between …
Microstructural Investigation and High Temperature Mechanical Behavior of AXE622 Cast Mg Alloy
Eftekhar, A. Habibi; Sadrossadat, S. Mohsen; Reihanian, M.
The microstructure and high temperature properties of the AXE622 Mg alloy were investigated after the conventional and semisolid casting processes. The tensile test was conducted at room temperature, and 473 K. Impression creep test was performed at a temperature range of 423-498 K under the stress range of 450-600 MPa. The microstructure of the c…
Expediting DECam Multimessenger Counterpart Searches with Convolutional Neural Networks
Bechtol, K.; García-Bellido, J.; Soares-Santos, M. +11 more
Searches for counterparts to multimessenger events with optical imagers use difference imaging to detect new transient sources. However, even with existing artifact-detection algorithms, this process simultaneously returns several classes of false positives: false detections from poor-quality image subtractions, false detections from low signal-to…
Exploring Gravitationally Lensed z ≳ 6 X-Ray Active Galactic Nuclei Behind the RELICS Clusters
Bradač, Maruša; Strait, Victoria; Coe, Dan +5 more
Although observations of high-redshift quasars demonstrate that many supermassive black holes (BHs) reached large masses within one billion years after the Big Bang, the origin of the first BHs is still a mystery. A promising way to constrain the origin of the first BHs is to explore the average properties of z ≳ 6 BHs. However, typical BHs remain…